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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
Chemistry of Carbohydrates03:25

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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...

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Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
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Published on: October 2, 2017

Búsqueda y optimización de conjuntos de estructura para azúcares flexibles complejos.

Junchao Xia1, Claudio J Margulis, David A Case

  • 1BioMaPS Institute and Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, United States. junchao-xia@biomaps.rutgers.edu

Journal of the American Chemical Society
|August 26, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Los métodos de Resonancia Magnética Nuclear (RMN) ahora pueden determinar la geometría molecular mediante el análisis de conjuntos de conformadores flexibles de carbohidratos. Este estudio introduce un nuevo enfoque computacional para pesar con precisión estos conformadores para los azúcares de la leche humana.

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Área de la Ciencia:

  • Química de los hidratos de carbono.
  • Biología estructural Biología estructural.
  • Química computacional es la química computacional.

Sus antecedentes:

  • Las restricciones de la Resonancia Magnética Nuclear (RMN) se utilizan típicamente para la determinación de la geometría molecular cuando domina una sola conformación de baja energía.
  • Las moléculas flexibles como los carbohidratos a menudo existen como un conjunto de conformadores de baja energía, lo que complica el análisis estructural directo utilizando RMN.
  • Los acoplamientos dipolares residuales (RDC) y los acoplamientos escalares son observables de RMN sensibles a la conformación molecular.

Objetivo del estudio:

  • Desarrollar y validar un nuevo procedimiento computacional para identificar y ponderar las contribuciones conformistas dentro de un conjunto.
  • Aplicar este método a los oligosacáridos de la leche humana para determinar sus poblaciones conformacionales.
  • Para evaluar la rigidez de los enlaces glucósidos en epítopos del grupo histo-sangre.

Principales métodos:

  • Utilizó un algoritmo genético para minimizar globalmente el factor R entre los RDC calculados y experimentales.
  • Empleado el software de predicción rápida de la estructura del azúcar (FSPS) para búsquedas conformacionales exhaustivas de mínimos locales.
  • Peso optimizado del conformador basado en comparaciones con observables de RMN como RDC y acoplamientos escalares.

Principales resultados:

  • Se aplicó con éxito el marco a seis azúcares de la leche humana (LND-1, LNF-1, LNF-2, LNF-3, LNnT, LNT).
  • Peso de población determinado para el conjunto de conformes para cada azúcar.
  • Demostrado que los RDC pueden ser representados con precisión por un pequeño subconjunto de conformadores dominantes.

Conclusiones:

  • El procedimiento desarrollado modela efectivamente conjuntos conformacionales de carbohidratos flexibles utilizando datos de RMN.
  • Unos pocos conformadores clave son suficientes para representar los RDC de los azúcares de la leche humana estudiados.
  • Los resultados sugieren una rigidez significativa en varios, pero no todos, los enlaces glucósidos dentro de los epítopos del grupo histo-sangre.